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1 June 1999 Broadband phase-modulating system for white-light Fourier transformations
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We discuss a white-light processing system that produces a dynamic, achromatic Fourier transformation over the visible spectrum. The system includes an achromatic Fourier transform lens system and a low-dispersion spatial light modulator. A programmable phase mask can only write patterns with a spatial frequency appropriate for one wavelength. However, this problem is resolved by scaling broadband light from a point source to a common spatial frequency using an achromatic Fourier transformer. Then, the programmable phase mask must produce the same phase profile for all wavelengths. Using a chiral smectic liquid crystal (CSLC) spatial light modulator can minimize the wavelength dependence of the phase shifting elements. Phase modulation is accomplished by re-orientation of the optic axis in a plane transverse to the direction of propagation in a manner similar to mechanical rotation of a waveplate. The position of the optic axis is the same for all wavelengths and ideally so is the induced phase shift. We present experimental far field diffraction patterns due to a CSLC spatial light modulator that produces a binary broadband phase mask and an achromatic Fourier transform lens system. An analog modulator is also introduced. Applications for this technology include optical process, beam steering and adaptive optics.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jay E. Stockley, Steven A. Serati, Darius Subacius, Kevin Joseph McIntyre, and Ken F. Walsh "Broadband phase-modulating system for white-light Fourier transformations", Proc. SPIE 3633, Diffractive and Holographic Technologies, Systems, and Spatial Light Modulators VI, (1 June 1999);

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